Controlling Connectivity of Low-Battery-Energy Device Based on Uplink Noise in Serving Cell

1. A method for controlling connectivity of a user equipment device (UE) in a wireless communication system comprising a plurality of cells, wherein a first access node is configured to provide at least a first cell of the plurality, the method comprising: serving by the first access node at least a first UE, the first UE being connected with the first access node in the first cell; while the first UE is connected with the first access node in the first cell, determining by the first access node that uplink noise in the first cell is threshold high; and responsive to at least determining that the uplink noise in the first cell is threshold high, applying by the first access node a battery-level-based UE-offloading process to offload the first UE from the first cell based on the first UE having threshold low remaining battery energy.

2. The method of claim 1 , wherein determining by the first access node that the uplink noise in the first cell is threshold high comprises determining by the first access node that the uplink noise in the first cell is at least as high as a defined noise threshold.

3. The method of claim 2 , wherein determining that the uplink noise in the first cell is at least as high as the defined noise threshold comprises (i) measuring the uplink noise in the first cell, (ii) comparing the measured uplink noise in the first cell with the defined noise threshold, and (iii) based on the comparing, determining that the measured uplink noise in the first cell is at least as high as the defined noise threshold.

4. The method of claim 3 , wherein the first cell defines an uplink frequency channel, and wherein measuring the uplink noise in the first cell comprises measuring the uplink noise on the uplink frequency channel in absence of scheduled uplink data transmission to the first access node on the uplink frequency channel.

5. The method of claim 1 , wherein applying the battery-level-based UE-offloading process comprises: determining that the remaining battery energy of the first UE is at least as low as a defined battery-energy threshold; and responsive to at least determining that the remaining battery energy of the first UE at least as low as the defined battery-energy threshold, offloading the first UE from the first cell.

6. The method of claim 5 , further comprising receiving by the first access node from the first UE a report of the remaining battery energy of the UE, wherein determining that the remaining battery energy of the first UE is at least as low as the defined battery-energy threshold comprises (i) comparing the reported remaining battery energy of the first UE with the defined battery-energy threshold and (ii) based on the comparing, determining that the remaining battery energy of the first UE is at least as low as the defined battery-energy threshold.

7. The method of claim 5 , wherein offloading the first UE from the first cell is additionally responsive to a determination that the first cell is threshold highly loaded.

8. The method of claim 5 , wherein the first access node is further configured to provide a second cell of the plurality, and wherein offloading the first UE from the first cell comprises transitioning the first UE from being connected with the first access node in the first cell to being connected with first access node instead in the second cell.

9. The method of claim 5 , wherein a second access node is configured to provide a second cell of the plurality, and wherein offloading the first UE from the first cell comprises transitioning the first UE from being connected with the first access node in the first cell to being connected instead with second access node in the second cell.

10. A method for controlling connectivity of a user equipment device (UE) in a wireless communication system comprising a plurality of cells, wherein a first access node is configured to provide at least a first cell of the plurality, the method comprising: determining that both uplink noise in the first cell is threshold high and remaining battery energy of a UE connected with the first access node in the first cell is threshold low; and responsive to at least the determining that both the uplink noise in the first cell is threshold high and the remaining battery energy of the UE connected with the first access node in the first cell is threshold low, working by the first access node to disconnect the UE from being connected with the first access node in the first cell.

11. The method of claim 10 , wherein determining that both uplink noise in the first cell is threshold high and remaining battery energy of a UE connected with the first access node in the first cell is threshold low comprises: measuring the uplink noise in the first cell, and determining that the measured uplink noise is at least as high as a defined noise threshold; and receiving from the UE a report of the remaining battery energy of the UE, and determining that the reported remaining battery energy of the UE is at least as low as a defined battery-energy threshold.

12. The method of claim 10 , wherein working by the first access node to disconnect the UE from being connected with the first access node in the first cell comprises the first access node signaling to the UE to cause the UE to scan for a target cell to which to hand over.

13. The method of claim 10 , wherein working by the first access node to disconnect the UE from being connected with the first access node in the first cell further comprises the first access node processing a transition of the UE from the first cell to a second cell.

14. The method of claim 13 , wherein the second cell is also provided by the first access node.

15. The method of claim 13 , wherein the second cell is provided by a second access node.

16. An access node comprising: a wireless communication interface through which to serve user equipment devices (UEs) in a cell defining a downlink and an uplink; and a controller, wherein the controller is configured to cause the access node to carry out operations when a UE is connected with the access node in the cell, the operations including: determining that uplink noise in the cell is threshold high; and responsive to at least determining that the uplink noise in the cell is threshold high, applying a battery-level-based UE-offloading process to offload the UE from the cell based on the UE having threshold low remaining battery energy.

17. The access node of claim 16 , wherein the controller comprises at least one processing unit, at least one non-transitory data storage, and program instructions stored in the at least one non-transitory data storage and executable by the at least one processing unit to cause the access node to carry out the operations.

18. The access node of claim 16 , wherein applying the battery-level-based UE-offloading process comprises: determining that the remaining battery energy of the UE is at least as low as a defined battery-energy threshold; and responsive to at least determining that the remaining battery energy of the UE at least as low as the defined battery-energy threshold, offloading the UE from the cell.

19. The access node of claim 18 , wherein the operations additionally include receiving from the first UE a report of the remaining battery energy of the UE, wherein determining that the remaining battery energy of the UE is at least as low as the defined battery-energy threshold comprises (i) comparing the reported remaining battery energy of the UE with the defined battery-energy threshold and (ii) based on the comparing, determining that the remaining battery energy of the UE is at least as low as the defined battery-energy threshold.

20. The access node of claim 18 , wherein offloading the UE from the cell comprises transitioning the UE from being connected in the cell to being connected instead in another cell.